"[Cities Without Ground is] an homage to a quirk of Hong Kong’s urban landscape: The fact that it’s possible to walk for miles above ground, thanks to the city’s densely layered pedestrian bridges that crisscross the sky, connecting buildings and spanning wide boulevards."

"A particular highlight... focus[es] solely on the city's air-conditioning, suggesting a kind of thermal cartography of indoor space and implying that temperature control and even humidity are better metrics for evaluating the success of a given project than mere visual or aesthetic concerns."

"Cities Without Ground, explores... pedestrian infrastructure formed over the past 50 years around, above, and under the city... documented with detailed drawings and 3D models... showing Hong Kong as we have never seen it before."

"Cities Without Ground... take[s] you through the vast interior public world of Hong Kong's pedestrian street network. With this guide you can travel for miles and miles without ever touching the ground: an interior world superimposed on the city. In an age of rapid urbanization and unstable climate, might this be a model for the future?"

"Cities Without Ground: A Hong Kong Guidebook... [creates] the first-ever maps showing the extent and variety of [Hong Kong's pedestrian] networks... the book comprehensively documents the walkways through highly detailed drawings and 3D models."